JP2009266683A - Electrodeless discharge lamp, and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp capable of suppressing temperature rise of the coldest point, and having high luminous efficiency. <P>SOLUTION: This electrodeless discharge lamp is provided with: a bulb 1A having a discharge gas and mercury filled in a gastight vessel formed of a translucent material, and formed with recessed parts 1a; induction coils 2 arranged in the recessed parts 1a formed on the bulb 1A; heat conductors 4 inserted in the recessed parts 1a formed on the bulb 1A, and dissipating heat generated by the induction coils 2 to the outside of the recessed parts 1a; and a base 7 arranged over openings of the recessed parts 1a formed on the bulb 1A. A shade member 6 shading light emitted toward the base 7 from the bulb 1A is arranged between an end of the base 7 on the lamp side and the emission center of the bulb 1A, and a space 12 is formed between the shade member 6 and the base 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrodeless discharge lamp and a lighting fixture.

  As a conventional electrodeless discharge lamp, as shown in FIG. 7, a bulb 31 is formed from a light-transmitting material in a substantially spherical shape, and a recess 31 a and an exhaust projection 31 b are formed. The induction coil 32 disposed in the concave portion 31a, the core 33 around which the induction coil 32 is wound, and the heat generated in the induction coil 32 when inserted into the concave portion 31a of the valve 31 is released from the concave portion 31a to the outside. There is provided a heat conductor that includes a heat conductor 34 and a metal capsule 35 disposed in the exhaust projection 31b (see, for example, Patent Document 1).

  The bulb 31 has discharge gas and mercury sealed inside, and a protective film and a phosphor film are applied to the inner wall. The concave portion 31a is formed to protrude from the surface of the bulb 31 into the bulb 31, and a cylindrical exhaust convex portion 31b is formed with the tip closed from the substantially center of the bottom surface of the concave portion 31a toward the opening of the concave portion 31a. Yes. Further, a convex portion 31c is formed on the outer surface of the bulb 31 at a location substantially facing the concave portion 31a, and in the vicinity of the opening portion of the concave portion 31a, a protrusion protrudes outward from the concave portion 31a in the circumferential direction of the concave portion 31a. 31d is formed. In addition, a base 36 is covered with the opening of the recess 31 a of the valve 31.

  A glass rod 37 is disposed at the tip of the exhaust gas projection 31 b of the bulb 31, and a recess 38 is formed at a predetermined position, and a metal is interposed between the glass rod 37 and the recess 38. By disposing the capsule 35, the metal capsule 35 is fixed in the exhaust projection 31b.

  The metal capsule 35 is made of an iron-nickel alloy, and Zn—Hg is enclosed inside, and the mercury vapor pressure in the bulb 31 is controlled by releasing mercury at the time of lighting.

  The induction coil 32 is supplied with a high-frequency current, and generates a high-frequency electromagnetic field inside the valve 31 by electromagnetic induction.

  The core 33 is formed in a substantially cylindrical shape by a magnetic material such as ferrite.

  The heat conductor 34 is formed in a substantially cylindrical shape from a metal having a good heat conductivity such as copper, and the diameter of the end portion on the side of the base 36 is enlarged.

  In the electrodeless discharge lamp having the above configuration, when a high frequency current is passed through the dielectric coil 32, a high frequency electromagnetic field is generated around the induction coil 32, and plasma is generated in the bulb 31. When plasma is generated, mercury atoms are excited, and the excited mercury atoms emit ultraviolet rays when returning to the ground state, and the ultraviolet rays are converted into visible light by the phosphor film applied to the inner wall of the bulb 31, and the bulb 31 is irradiated. Released to the outside.

  Here, in the electrodeless discharge lamp, the light output may be lowered due to the change in the mercury vapor pressure in the bulb 31, and it is necessary to secure the coldest point for controlling the mercury vapor pressure.

  Therefore, in the electrodeless discharge lamp in the conventional example, in order to prevent the temperature at the coldest spot near the base 36 from rising, the discharge volume in the vicinity of the opening of the recess 31a is reduced by the protrusion 31d formed in the recess 31a of the bulb 31. The temperature is increased by suppressing the light emission volume near the opening of the recess 31a.

  Furthermore, as another method for preventing the temperature of the coldest part from rising, a protrusion 31e is provided on the surface of the valve 31 at a position where the valve 31 and the base 36 face as shown in FIG. There is a point.

Moreover, in order to prevent an electrodeless discharge lamp from becoming high temperature, there exists a lighting fixture in which the heat sink was attached to the fixing member which fixes a lamp | cap | die of a lamp | ramp (for example, refer patent document 2).
JP 2006-269229 A JP 2005-93266 A

  In the electrodeless discharge lamp, as the input electric power increases, the heat generated in the induction coil 32 increases and the temperature in the recess 31a also increases. Therefore, the temperature of the valve 31 near the base 36 is lower on the surface side than on the concave portion 31a side, and the surface of the valve 31 near the base 36 becomes the coldest point. That is, by suppressing an increase in the temperature of the surface of the bulb 31 near the base 36, an excessive increase in the mercury vapor pressure in the bulb 31 can be suppressed, and a decrease in luminous efficiency can be prevented.

  Since the protrusion 31d provided on the electrodeless discharge lamp shown in FIG. 7 cannot protrude to the outer surface of the bulb 31, it completely shields the heat generated in the bulb 31 from moving toward the base 36. I can't.

  Further, since the bulb 31 is translucent, it cannot prevent the light of the electrodeless discharge lamp from being irradiated in the direction of the base 36, and the temperature at the coldest spot on the surface of the bulb 31 near the base 36 is sufficiently increased. Can not be suppressed.

  On the other hand, in the electrodeless discharge lamp shown in FIG. 8, since the bulb itself is made of a light-transmitting material, the light shielding effect by the protrusion 31e is small, and there is the coldest spot on the bulb 31 surface near the base 36. In this case, the temperature rise at the coldest spot cannot be suppressed.

  This invention is made | formed in view of the said reason, The objective is to provide the electrodeless discharge lamp and lighting fixture which can suppress the temperature rise of the coldest point and have high luminous efficiency.

  According to a first aspect of the present invention, there is provided a bulb in which a discharge gas and mercury are enclosed in an airtight container made of a light-transmitting material and a recess is formed, and an induction coil disposed in the recess formed in the bulb. A lamp comprising a heat conductor that is inserted into a recess formed in the bulb and discharges heat generated by the induction coil to the outside of the recess, and a cap that covers the opening of the recess formed in the bulb. A light-shielding member that shields light emitted from the bulb toward the base is disposed between the side end portion and the light emission center of the bulb, and a gap is provided between the light-shielding member and the base. To do.

  According to this invention, in the electrodeless discharge lamp, when the coldest spot is provided on the surface of the bulb near the base, the light shielding member shields the light irradiated from the bulb toward the base, and the coldest spot is provided. The rise in the surface temperature of the valve near the base can be suppressed. Further, since the gap is provided between the light shielding member and the base, it is possible to suppress heat from being transmitted from the light shielding member to the base even when the temperature of the light shielding member is increased. Therefore, it is possible to provide an electrodeless discharge lamp that can suppress the temperature rise at the coldest spot and has high luminous efficiency. Moreover, since the light shielding member is formed as a separate part from the bulb, it can be created even with a complicated shape.

  According to a second aspect of the present invention, in the first aspect of the invention, the bulb is provided with a hollow portion at a location where the base faces, and the light shielding member is disposed along the hollow portion. .

  According to the present invention, when the coldest point is provided on the valve surface on the base side with respect to the light shielding member, the recessed portion provided in the valve causes the plasma to approach the bulb on the base side with respect to the light shielding member. It is possible to suppress the heat generated from the plasma from being transmitted to the vicinity of the coldest spot. Furthermore, the light shielding member disposed in the depression can suppress the irradiation of the plasma light to the base side of the light shielding member, and also shields the light irradiated from the surface of the bulb toward the base. Can do. Therefore, when the coldest spot is provided on the bulb surface in the vicinity of the base, an increase in the temperature of the coldest spot can be suppressed, and an electrodeless discharge lamp with high luminous efficiency can be provided.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the outer surface of the valve is provided with a protrusion at a location substantially facing the concave portion.

  According to this invention, when the tip of the bulb of the electrodeless discharge lamp is mounted facing upward, the surface of the bulb near the base becomes the coldest point, but when the tip of the bulb is mounted facing downward, The protrusion provided on the bulb becomes the coldest spot, and the temperature rise at the coldest spot can be suppressed regardless of the lamp mounting direction, thereby providing an electrodeless discharge lamp with high luminous efficiency.

  According to a fourth aspect of the present invention, the electrodeless discharge lamp according to any one of the first to third aspects is provided.

  According to this invention, the lighting fixture provided with the electrodeless discharge lamp which can suppress the temperature rise of the coldest point and has high luminous efficiency can be provided. Furthermore, by using an electrodeless discharge lamp, a lighting device with low power consumption and long life can be provided.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a reflector that covers a part of the bulb is disposed from the vicinity of the light shielding member provided in the electrodeless discharge lamp according to the first or second aspect. According to the present invention, when the electrode tip of the electrodeless discharge lamp is mounted with the tip thereof facing upward, the hot air generated from the bulb is transmitted to the bulb surface near the base serving as the coldest spot. It can be shielded by using a reflector. Therefore, the lighting fixture provided with the electrodeless discharge lamp which can suppress the temperature rise of the coldest point and has high luminous efficiency can be provided.

  According to a sixth aspect of the present invention, in the fourth aspect of the invention, a reflector that covers a part of the bulb from the vicinity of the light shielding member provided in the electrodeless discharge lamp according to the third aspect, and the vicinity of the root of the protrusion provided on the bulb To at least one of a reflecting plate that covers a part of the bulb.

  According to this invention, regardless of the lamp mounting direction, it is possible to shield the hot air generated from the bulb from being transmitted to the coldest spot by using the reflector, and to suppress the temperature rise at the coldest spot. Thus, it is possible to provide a lighting fixture including an electrodeless discharge lamp with high luminous efficiency.

  As described above, the present invention has an effect that it is possible to provide an electrodeless discharge lamp and a lighting fixture that can suppress the temperature rise at the coldest spot and have high luminous efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 and 2, the electrodeless discharge lamp according to the present invention is formed of a translucent material into a substantially spherical shape (maximum diameter of 180 mm), and includes a bulb 1A having a concave portion 1a and an exhaust convex portion 1b, and a concave portion. An induction coil 2 disposed in 1a, a core 3 around which the induction coil 2 is wound, and a heat conductor that is disposed in the recess 1a and releases heat generated in the induction coil 2 from the recess 1a to the outside. 4, a metal capsule 5 disposed in the exhaust projection 1b, a base 7 covering one end of the bulb 1A, an end of the base 7 on the bulb 1A side, and a light emission center of the bulb (the bulb 1A has a diameter of 1A). And a light shielding member 6 disposed between the largest portion).

  First, in the bulb 1A, argon gas and mercury are enclosed, and a protective film and a phosphor film are applied to the inner wall. The recess 1a is formed so as to protrude from the one end side surface of the valve 1A toward the inside of the valve 1A, and has a cylindrical exhaust with the tip closed from the substantially center of the bottom surface of the recess 1a toward the opening of the recess 1a. Convex part 1b is formed.

  In the recess 1a, a long cylindrical heat conductor 4 is disposed by inserting the exhaust protrusion 1b into the cylinder, and on the outer periphery of the heat conductor 4, a cylindrical core 3 is disposed. An induction coil 2 is wound around the outer periphery of 3.

  The induction coil 2 uses a litz wire, and a high frequency current of 135 kHz is supplied with a supplied power of 240 W from a lighting circuit (not shown), and a high frequency electromagnetic field is generated inside the bulb 1A by electromagnetic induction.

  The core 3 is formed in a substantially cylindrical shape from a magnetic material such as manganese-based ferrite, and forms a magnetic path of magnetic flux generated by the induction coil 2 to increase the plasma generation efficiency.

  The heat conductor 4 is formed of a copper pipe, and a disk-like fixing base 10 is provided on the end surface of the base 7.

  Next, the base 7 is formed in a cylindrical shape from PET resin, and is covered with the opening of the recess 1a and fixed to the valve 1A with a silicon-based adhesive.

  Further, a glass rod 8 is disposed at the tip of the exhaust projection 1b of the valve 1A, and a recess 9 is formed at a predetermined position of the exhaust projection 1b. By disposing the metal capsule 5 between the portions 9, the metal capsule 5 is fixed in the exhaust projection 1 b.

The metal capsule 5 is made of an iron-nickel alloy, ZnHg having a ratio of 50:50 is enclosed, and mercury is released during lighting to control the mercury vapor pressure in the bulb 1A. A plurality of rod-shaped support members 11 formed and extended from the periphery of one end of the base 7 on the valve 1A side are connected to the base 7 to form a space 12 between the base 7 and the base 7. The valve 1A is inserted into the ring.

  In the electrodeless discharge lamp having the above configuration, when a high frequency current is passed through the induction coil 2, a high frequency electromagnetic field is generated around the induction coil 2. Plasma is generated in the bulb 1A by this high-frequency electromagnetic field, and the inside of the bulb 1A becomes high temperature due to the generation of plasma, the mercury in the metal capsule 5 is vaporized and emitted into the bulb 1A, and the electrons collide with mercury atoms. And mercury atoms emit ultraviolet rays. The ultraviolet light is converted into visible light by the phosphor film applied to the inner surface of the bulb 1A, passes through the bulb 1A and is emitted to the outside, and the lamp is lit.

  On the other hand, the induction coil 2 becomes hot due to the flow of the high-frequency current, and the heat generated in the induction coil 2 is transmitted to the heat conductor 4 and released to the outside. Therefore, the heat conductor 4 and the inside of the concave portion 1a of the valve 1A are heated, and the temperature in the vicinity of the base 7 of the valve 1A is lower on the surface side than the concave portion 1a (inner side), and the coldest point is the base 7 It becomes the surface of the nearby valve 1A. The tendency that the coldest point is in the vicinity of the base 7 is strengthened when the electrodeless discharge lamp is mounted with the tip of the bulb 1A facing upward.

  Here, in the electrodeless discharge lamp described above, the light irradiated in the direction of the base 7 out of the light irradiated from the bulb 1 </ b> A is shielded by the light shielding member 6, and the base 7 is not irradiated with light. Temperature rise can be prevented.

  At this time, the light shielding member 6 is heated to high temperature by the light of the lamp. However, since the light shielding member 6 is fixed to the base 7 via the support member 11, a gap 12 is provided between the light shielding member 6 and the base 7. Thus, the heat of the light shielding member 6 is difficult to be transmitted to the base 7.

  In addition, since the base 7 is made of PET resin, the thermal conductivity is low and it is difficult to reach a high temperature, so that it is difficult for heat to be transmitted to the coldest point.

  From the above, in the electrodeless discharge lamp according to the present embodiment, the light traveling from the bulb 1 </ b> A toward the base 7 is shielded by the light shielding member 6, and further, a gap 12 is formed between the light shielding member 6 and the base 7. As a result, the heat of the light shielding member 6 is difficult to be transmitted to the base 7, so that the temperature rise around the base 7 is suppressed, and the temperature rise at the coldest spot on the surface of the bulb 1 A near the base 7 is suppressed to emit light. An electrodeless discharge lamp with high efficiency can be provided.

  Moreover, since the light shielding member 6 is formed separately from the bulb 1A, it can be created even if it has a complicated shape.

  Furthermore, the light shielding member 6 is made of aluminum, shields the noise electromagnetic field from the bulb 1A, and takes measures against noise in an electronic device (such as a lighting circuit for controlling the lighting of the electrodeless discharge lamp) around the electrodeless discharge lamp. It is easy to do.

(Embodiment 2)
Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG. However, the description of the configuration common to the first embodiment is omitted. The electrodeless discharge lamp according to the present embodiment includes a bulb 1B having a recess 1c formed at a location facing the base 7, and an annular light shielding member 13 is disposed along the recess 1c in the recess 1c. It is installed.

  The light shielding member 13 is formed in an annular shape having a width of 30 mm in the radial direction by a resin material, and is fixed to the base 7 by the support member 11 in the same manner as the light shielding member 6 of the first embodiment, and is fitted in the recess 1c of the valve 1B. After being combined, it is fixed to the valve 1B by a silicon adhesive.

  With the above configuration, in the electrodeless discharge lamp in the present embodiment, the depression 1c formed in the bulb 1B can suppress the plasma in the bulb 1B from approaching the base 7 side than the depression 1c. It is possible to suppress the generated heat from being transmitted to the base 7 side.

  Furthermore, it is possible to suppress the irradiation of plasma light from the surface of the bulb 1 </ b> B toward the base 7 by suppressing the irradiation of the light toward the base 7 with respect to the base 1 by the light shielding member 13 disposed in the recess 1 c. The irradiated light is also shielded by the light shielding member 13.

  Further, since the light shielding member 13 is made of a resin material, the thermal conductivity is low, and the temperature rise due to the light irradiation is suppressed, so that the heat transfer from the light shielding member 13 to the base 7 is suppressed. I can do it.

  Therefore, when the coldest spot is provided on the surface of the bulb 1B closer to the base 7 than the light shielding member 13, the temperature rise near the base 7 is suppressed, the temperature rise at the coldest spot is suppressed, and the luminous efficiency of the lamp is increased. I can keep it.

  In addition, since the light shielding member 12 is fitted in the recess 1c of the valve 1B and further adhered to the valve 1B, an adhesive that adheres the valve 1B and the light shielding member 12 by heat generated in the valve 1B is used. Even if it deteriorates, the valve 1B does not fall off. Therefore, compared with a bulb in which the bulb has no depression 1c and is fixed to the light shielding member 12 only by adhesion, the bulb holding reliability is high, and in particular, the electrodeless discharge lamp in a state where the tip of the bulb 1B is directed downward. When the is attached, the valve 1B can be prevented from dropping, which is effective.

(Embodiment 3)
Hereinafter, Embodiment 3 of the present invention will be described with reference to FIGS. However, description of portions common to the first embodiment is omitted. In addition, the top, bottom, left and right in FIG.

  A lighting fixture 20A according to the present embodiment includes an electrodeless discharge lamp 29 including a bulb 1C having a protrusion 1d having a height of 30 mm at a position substantially facing the recess 1a, and a cylindrical shape having an opening formed on the lower surface. Main body portion 19, a bowl-shaped outer shell portion 17 disposed on the lower surface side of the main body portion 19, and a reflecting plate 16 formed along the inner surface of the outer shell 17.

  The main body 19 is provided with a mounting portion 18 made of a 2 mm steel plate on the upper surface, a socket 15 is disposed in the vicinity of the opening on the lower surface, and the base 7 of the electrodeless discharge lamp 29 is mounted on the socket 15. Electrodes (not shown) of the socket 15 and the base 7 are connected to each other. In addition, a lighting circuit 14 for lighting the electrodeless discharge lamp 29 is accommodated in the main body 19.

  The lighting circuit 14 includes a steel plate outline of about 1 mm, outputs high-frequency power of 240 W with an input power of 260 W, and supplies power to the induction coil 2 of the electrodeless discharge lamp 29 through the socket 15.

  The outer shell 17 is expanded in diameter downward from the periphery of the opening provided on the lower surface of the main body portion 19, and the reflecting plate 16 is disposed on the inner surface side of the outer shell 17 with a predetermined interval.

  The reflecting plate 16 is formed in a parabolic shape having a maximum inner diameter of 600 mm by an aluminum plate having a thickness of 1.4 mm. The insertion port 16a formed at the center is inserted into the valve 1C, and a light shielding member is formed on the upper surface side of the insertion port 16a. 6 is located.

  A glass panel 21 formed in a disk shape with an outer diameter of 600 mm and a thickness of 5 mm is covered with an opening on the lower side of the reflecting plate 16 by transparent tempered glass.

  In the lighting fixture 20A having the above configuration, when the attachment portion 18 is attached to a power supply portion provided on a wall surface or the like (not shown) with the tip of the bulb 1C facing downward, the projection 1d of the bulb 1C is The coldest spot.

  When the attachment portion 18 is attached to the power supply portion provided on the wall surface or the like with the tip of the valve 1C facing upward, the surface of the valve 1C near the base 7 becomes the coldest point, and the valve 1C The reflection plate 16 can suppress the generated hot air from reaching the base 7 side. In addition, the light irradiated from the bulb 1C toward the base 7 is reflected by the reflecting plate 16, and the light passing between the bulb 1C and the periphery of the insertion hole 16a is provided in the electrodeless discharge lamp 29. Since it is shielded by the light shielding member 6, the temperature rise at the coldest point due to the irradiation of light near the base 7 can be suppressed.

  Therefore, in the lighting fixture 20A in the present embodiment, when the tip of the bulb 1C is installed upward, the coldest spot on the surface of the bulb 1C near the base 7 and the light emission of the bulb 1C as the main heat generation source. By partitioning the center by the reflecting plate 16 and the light shielding member 6, it is possible to suppress the temperature rise at the coldest spot and provide a lighting device with high luminous efficiency.

  Further, since the bulb 1C is surrounded by the reflector 16 formed of an aluminum plate, the noise electromagnetic field generated by the bulb 1C is shielded, and an electronic device (for example, disposed around the electrodeless discharge lamp 29) , Lighting circuit 14 and the like).

  In addition, since the electrodeless discharge lamp 29 is used for the lamp, it is possible to provide a lighting apparatus with low power consumption and long life.

  In this embodiment, the electrodeless discharge lamp 29 having the protrusion 1d provided on the bulb 1A of the first embodiment is used. However, the electrodeless discharge lamp having the protrusion 1d provided on the bulb 1B of the second embodiment may be used. Good.

(Embodiment 4)
Hereinafter, Embodiment 4 of the present invention will be described with reference to FIG. However, structures common to the third embodiment are denoted by common reference numerals, and description thereof is omitted. Note that, with reference to the upper, lower, left, and right sides in FIG.

  The lighting fixture 20B in the present embodiment includes a box-shaped main body portion 22 having an opening on the lower surface, a glass panel 23 disposed in the opening of the main body portion 22, and disposed in the vicinity of the glass panel 23 inside the main body portion 22. Electrodeless discharge lamp 29, reflector 25 arranged in the vicinity of bulb 1C of electrodeless discharge lamp 29, socket 27 to which base 7 of electrodeless discharge lamp 29 is connected, and socket via cable 28 27 is connected to the lighting circuit 14.

  The main body 22 is formed in a rectangular parallelepiped shape having a length of 238 mm, a width of 650 mm, and a depth of 500 mm by a white stainless steel plate having a thickness of 3 mm. A space 24a (left) and a space 24b (right) are formed.

  The glass panel 23 is formed from transparent tempered glass to a length of 420 mm and a width of 340 mm, and is disposed on a step portion 22 a provided on the opening periphery of the lower surface of the space 24 a.

  In the electrodeless discharge lamp 29, the base 7 is attached to the socket 27, and the bulb 1 </ b> C is located near the glass panel 23.

  The reflection plate 25 is formed in a box shape having a lower surface opened from an aluminum plate having a thickness of 0.5 mm, surrounds the bulb 1 </ b> C, and the periphery of the opening faces the substantially periphery of the glass panel 23.

  Here, the valve 1C is inserted through insertion holes 25a and 25b provided in the left and right walls of the reflector 25, respectively, and reflected from the vicinity of the base of the projection 1d of the valve 1C to the surface of the valve 1C near the base 7. Covered by a plate 25.

  The socket 27 is connected to the lighting circuit 14 via a cable 28 that passes through the partition plate 26, and supplies lighting power to the electrodeless discharge lamp 29.

  In the lighting fixture 20B having the above-described configuration, the bulb 1C, which is the main heat generation source, is covered with the reflector 25, so that the hot air generated in the bulb 1C is shielded, and the hot air is in the vicinity of the protrusion 1d and the base 7 It is possible to suppress the transmission to the surface, and it is possible to suppress the temperature rise of the protrusion 1d serving as the coldest point or the surface of the valve 1C near the base 7.

  The light irradiated from the bulb 1C to the protrusion 1d and the base 7 is reflected by the reflecting plate 25, and the light passing between the bulb 1C and the periphery of the insertion hole 25b is shielded from the electrodeless discharge lamp 29. It is shielded by the member 6, and it can suppress that the temperature of the coldest point rises with the light from valve | bulb 1C.

  Therefore, the coldest spot of the bulb 1C and the light emission center of the bulb 1C, which is the main heat generation source, are partitioned by the reflector 25, so that the temperature rise at the coldest spot is suppressed and a lighting device with high luminous efficiency is obtained. Can be provided.

  In addition, since the bulb 1C is surrounded by the reflecting plate 25 formed of an aluminum plate, an electronic device that shields a noise electromagnetic field generated in the bulb 1C and is disposed around the electrodeless discharge lamp 29. The lighting fixture is easy to take measures against noise (for example, the lighting circuit 14).

  In the present embodiment, the vicinity of the root of the protrusion 1d serving as the coldest point and the surface of the bulb 1C near the base 7 are separated from the light emission center of the bulb 1C by the reflector 25. When the light source is attached in a state of being directed downward, a reflector may be used so that the vicinity of the base of the protrusion 1d and the light emission center of the bulb 1C are partitioned, and the tip of the bulb 1C is directed upward. When attaching with a reflector, a reflecting plate may be used so that the surface of the bulb 1C near the base 7 and the light emission center of the bulb 1C are partitioned.

1 is a cross-sectional view of an electrodeless discharge lamp according to Embodiment 1 of the present invention. The perspective view of the electrodeless discharge lamp in the same as the above is shown. Sectional drawing of the electrodeless discharge lamp in Embodiment 2 of this invention is shown. The cross-sectional schematic of the lighting fixture in Embodiment 3 of this invention is shown. The perspective view of the lighting fixture in the same as the above is shown. The cross-sectional schematic of the lighting fixture in Embodiment 4 of this invention is shown. Sectional drawing of the electrodeless discharge lamp in patent document 1 of a prior art example is shown. Sectional drawing of the electrodeless discharge lamp in patent document 2 in the same as the above is shown.

Explanation of symbols

1A Valve 1a Concave part 2 Induction coil 4 Thermal conductor 6 Light shielding member 7 Base 12 Air gap

Claims (6)

A bulb in which a discharge gas and mercury are enclosed in an airtight container formed of a translucent material, and a recess is formed;
An induction coil disposed in a recess formed in the valve;
A heat conductor that is inserted into a recess formed in the valve and discharges heat generated by the induction coil to the outside of the recess;
A base that covers the opening of the recess formed in the valve,
Between the lamp side end of the base and the light emission center of the bulb, a light shielding member that shields light emitted from the bulb toward the base is disposed, and a gap is provided between the light shielding member and the base. An electrodeless discharge lamp characterized by   2. The electrodeless discharge lamp according to claim 1, wherein the bulb is provided with a recessed portion at a position facing the base, and the light shielding member is disposed along the recessed portion.   The electrodeless discharge lamp according to claim 1, wherein the outer surface of the bulb is provided with a protrusion at a location substantially facing the recess.   A luminaire comprising the electrodeless discharge lamp according to claim 1.   The lighting apparatus according to claim 4, wherein a reflector that covers a part of the bulb is disposed from the vicinity of the light shielding member provided in the electrodeless discharge lamp according to claim 1.   A reflection plate that covers a part of the bulb from the vicinity of the light shielding member provided in the electrodeless discharge lamp according to claim 3 and a reflection plate that covers a portion of the bulb from the vicinity of the root of the protrusion provided on the bulb. The lighting apparatus according to claim 4, wherein one is provided.

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